Here’s a few views of the big lake below Arenal Volcano. There is a boat taxi that will take you across the lake to a car taxi that will take you up that mountain to Monteverde. The lake is also a favorite for local fishermen. My May 2018 trip here gave me better sunset photos of the lake – time of year does make a difference!
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Lake Arenal from the Observatory Lodge 
Lake Arenal 
Lake Arenal Sunset from Observatory Lodge 
Lake Arenal 
Lake Arenal Sunset 
Lake Arenal from Lodge
¡Pura Vida!